With all the amazing web services available now there are some that I do not think I can function without now and these are the services that I need to continue to remain productive online:
Gmail is probably my primary web tool because I live in my email and gmail makes it very easy to check all my various email accounts with ease!
Google Calendar is not only what I use to organize my life but, also what I use to organize my blog posts and I have it sync to my Nokia N800 because it keeps my busy schedule organized.
Although Facebook is much more of a fun network, I find it to be very userful to communicate with friends and kep in touch with people far away!
AIM is a great instant messenger and makes chatting great and a major communication asset.
Since I have been taking so many pictures recently and I want to share them with my friends and family Flickr is the best site to share pictures over the internet and Flickr Pro is an even better service!
Google Docs is a great basic Wordprocessor, Spreadsheet and Presnetation tool all based in the clouds and lets you collaborate with other users. Although it is as not as powerful as Microsoft Word, which I use for more formal purposes, it is great for planning with people and planning out projects.
Google Reader is my favorite way to read all my RSS feeds and get news. It provides a nice “River of News” that makes reading news anytime easy and elegant.
Twitter is a great social tool that I use not only to keep my friends up-to-date with what I am doing but, I also use it to market website I am workingon and it is an extremly valuable marketing tool.
If any of these services went down I would have to make major augmentations to make web life and adapt to live without them but it will certainly not be easy.